Are you ready to meet the BAU's newest team member? You've probably already seen the photos, but now the "Criminal Minds" season 10 premiere promo, released Monday, Sept. 1, offers a look at Jennifer Love Hewitt's Kate Callahan in action.

Monty Brinton/CBS, used with permission

In the "Criminal Minds" season 10 premiere, "X," the BAU is heading to California to investigate a series of murders that have left the victims unidentifiable, and new agent Kate Callahan joins the team and assists them in solving the case. As was revealed when it was announced Hewitt was joining the team, Kate is a seasoned undercover agent whose stellar work at the FBI lands her a spot on the team. We also know that Kerr Smith is guest starring in the premiere as Frank Cowles, an acromotophile, someone who collects limbs.

The "X" promo shows that JJ is the one who gets to deliver the news to someone who presumably knows Frank, since she's telling her that they found not one, but three legs in a man's car – unless the team is going to be pulling someone else over in the episode or Frank has framed someone. The new video also offers a look at Hotch welcoming Kate to the team. "I think you'll be a valuable asset," he tells her. "I am like a boy scout," she declares. Plus, you get a look at the team working the case, and it sounds like there may be a line of people who want to do the honors of arresting this UnSub.

"Criminal Minds" season 10 premieres Wednesday, Oct. 1, at 9 p.m. on CBS. What do you think of the "X" promo?

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Meredith Jacobs, a freelance entertainment writer, is the go-to girl for television news. She has followed her favorite shows since their beginnings, and she's always ready to report the latest information as it's released. She never misses an episode and is always looking forward to what's to come the next week on her favorite series. Contact Meredith here.